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初中物理课本第二册热机部分在谈到油汽机工作时指出:“汽油机在四个冲程中,只有做功冲程燃气对外做功,其他三个冲程是辅助冲程,要靠安装在曲轴上的飞轮的惯性来完成。”近年来流行的一些目标检测题也不断有类似这句话的填空题。笔者认为靠飞轮的惯性来完成其他三个冲程的提法不好,理由是:①此处所说的完成其他三个辅助冲程显然是指需要克服阻力做功,对于做功问题,还是从能量观点来解释为好。如果
The second part of the physics textbook of junior high school physics textbook mentioned when working on oil and gas turbines: “In the four strokes of the gasoline engine, only the power stroke gas is used for external work, and the other three strokes are auxiliary strokes, relying on the inertia of the flywheel mounted on the crankshaft. To complete.” Some of the popular target detection questions in recent years have continued to fill in blanks similar to this sentence. I believe that relying on the inertia of the flywheel to complete the other three strokes is not good, the reason is: 1 here to complete the other three auxiliary stroke is clearly refers to the need to overcome resistance to work, for the issue of work, or from the energy point of view to explain As well. in case